Hand grip exercise device



FIG. 1 is perspective view of my new hand grip exercise device;

FIG. 2 is a front elevational view thereof, and each of the back elevational view thereof, the right side elevational view thereof and left side elevational view thereof being identical thereto;

FIG. 3 is a top plan view thereof; and,

FIG. 4 is a bottom plan view thereof. 

The ornamental design for a hand grip exercise device, as shown and described. 